Females are less likely to have an X-linked
recessive disorder than males because
a. there are fewer girls than boys in the
general population.
b. females have two X chromosomes thus the
probability is lower.
c. in males, the Y chromosome causes X
genes to mutate.
d. X-linked recessive disorders are lethal to
female embryos.
e. X chromosomes have protector genes that
protect against mutations thus with two Xs,
females have twice the protection as males.
B
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What feature of a dinosaur determines whether it is a saurischian or an ornithischian dinosaur?
a. size b. habitat c. feeding preference d. pelvic bone structure e. number of feet it walks on
Archaea are resistant to damage by harsh conditions because their membrane lipids, unlike those of bacteria and eukaryotes, have
A. isoprene chains B. peptidoglycan C. fatty acid chains D. ether linkages E. ester linkages
Enhancers can be identified by.
a. cloning a region of DNA with the putative enhancer in a reporter plasmid and demonstrating an increase in gene expression when the construct is introduced into a eukaryotic cell.
b. sequence comparison with promoter sequences that are already known.
c. introducing two separate pieces of DNA into a eukaryotic cell. One is a fragment of DNA with the putative enhancer and the other is a plasmid that contains a reporter gene.
d. cloning the putative enhancer into a plasmid and measuring the level of reporter gene expression in a prokaryotic cell.